| CID | Model
year |
Main
Cap Bolt |
Bore | Stroke | Cylinder
Volume |
Rod
length Rod ratio |
Additional comments |
|
| 366T | 66-91 | 4 | 3.935 | 3.76 | 45.726 | 6.135 / 1.63 | Cast iron tall deck truck block | |
| 366T | 91-95 | 4 | 3.935 | 3.76 | 45.726 | 6.135 / 1.63 | Gen. V, tall deck truck block, one piece rear main seal | |
| 366T | 96- | 4 | 3.935 | 3.76 | 45.726 | 6.135 / 1.63 | Gen. VI, tall deck truck block, one piece rear main seal | |
| 396 | 65-69 | 2 & 4 | 4.094 | 3.76 | 49.496 | 6.135 / 1.63 | -- | |
| 402 | 69-72 | 2 & 4 | 4.125 | 3.76 | 50.248 | 6.135 / 1.63 | -- | |
| 427 | 66-69 | 2 & 4 | 4.250 | 3.76 | 53.340 | 6.135 / 1.63 | Cast iron block, short deck | |
| 427 | 69 | 4 | 4.250 | 3.76 | 53.340 | 6.135 / 1.63 | Aluminum block with cast iron liners, ZL-1, Very rare | |
| 427T | 66-90 | 4 | 4.250 | 3.76 | 53.340 | 6.135 / 1.63 | Cast iron Mark IV tall deck truck block | |
| 427T | 91-95 | 4 | 4.250 | 3.76 | 53.340 | 6.135 / 1.63 | Gen. V tall deck truck block, one piece rear main seal | |
| 427T | 96- | 4 | 4.250 | 3.76 | 53.340 | 6.135 / 1.63 | Gen. VI tall deck truck block, one piece rear main seal | |
| 430 | 69 | 4 | 4.440 | 3.47 | 53.726 | 6.135 / 1.76 | Aluminum race block with cast iron liners, extremely rare | |
| 454 | 70-90 | 2 & 4 | 4.250 | 4.0 | 56.745 | 6.135 / 1.53 | Mark IV, short deck | |
| 454 | 91-95 | 4 | 4.250 | 4.0 | 56.745 | 6.135 / 1.53 | Gen. V, one piece rear main seal | |
| 454 | 96- | 4 | 4.250 | 4.0 | 56.745 | 6.135 / 1.53 | Gen. VI, one piece rear main seal | |
| 465 | 70-71 | 4 | 4.440 | 3.76 | 58.216 | 6.135 / 1.63 | Aluminum race block with cast iron liners, extremely rare | |
| 495 | 70-71 | 4 | 4.440 | 4.0 | 61.932 | 6.135 / 1.53 | Aluminum race block with cast iron liners, extremely rare | |
| 495 | 72 | 4 | 4.440 | 4.0 | 61.932 | 6.135 / 1.53 | Aluminum race block without iron liners, extremely rare | |
| 502 | 92-95 | 4 | 4.466 | 4.0 | 62.659 | 6.135 / 1.53 | Gen. V HO. one piece rear main seal | |
| 502 | 96- | 4 | 4.466 | 4.0 | 62.659 | 6.135 / 1.53 | Gen. VI HO. one piece rear main seal, short deck | |
| 510 | 72 | 4 | 4.500 | 4.0 | 63.617 | 6.135 / 1.53 | Aluminum race block without iron liners, extremely rare | |
| 510* | 97- | 4 | 4.500 | 4.0 | 63.617 | 6.135 / 1.53 | Mark IV Bowtie, two-piece seal, short deck, cast iron | |
| 510* | 97- | 4 | 4.500 | 4.0 | 63.617 | 6.135 / 1.53 | Mark IV Bowtie, two-piece seal, long deck, cast iron | |
| * Actual CID of these blocks are 509 but Chevrolet has designated them as 510 so we do the same. | ||||||||
| MARK IV / GEN V/VI Differences | ||||||||
| Mark IV | GEN. V | GEN. VI | CNC Bowtie | |||||
| Rear Oil Seal | Two-piece | One-piece | One-piece | Two-piece | ||||
| Main Oil Feed | Left side oil pan rail | Camshaft tunnel | Camshaft tunnel | Camshaft tunnel | ||||
| Mec. fuel pump boss | Yes | No | Yes | No | ||||
| Clutch Z-Bar pivot stud buss | Yes | No | No | Yes | ||||
| Adjustable valve train | Yes | No | No | Yes | ||||
| Rocker Covers | Stanped steel | Cast aluminum | cast aluminum | |||||
| Oil Pans | Use pan for two-piece main seal | Use pan for one-piece main seal | Use pan for one-piece main seal | Must use pan for two-piece main seal | ||||
| There are some more differences than the above. | ||||||||